The eastern border of the Sa˜o Francisco craton is characterized by widespread Mesoproterozoic (1.0 Ga) tholeiitic dykes and minor
analogues of Early Cretaceous age (130 Ma). The Mesoproterozoic dykes (Salvador, Olivenc¸a, Espinhac¸o, Diamantina) show large
elemental and Sr–Nd isotopic variations that suggest different parental melts related to a small-scale heterogeneous mantle of depleted
residua and enriched components (Statistical Upper Mantle Assemblage, SUMA), responsible for plume- and crust-type signatures. The
Mesoproterozoic intrusions, compatible with early stages of Rodinia breakup, may represent the initial breakup of the Sa˜o Francisco–
Congo junction. Early Cretaceous dykes (Espinhac¸o) reveal normal and reversed polarities, indicating two distinct intrusive periods.
These intrusions have elemental and Sr–Nd isotopic compositions similar to those of the coeval (132 Ma) high-TiO2 tholeiites from
southern Parana´ Basin (Urubicı´-type, Brazil) and northern Etendeka (Khumib-type, Namibia). The genesis of these tholeiites requires
lithospheric mantle components, as represented by K-alkaline (and carbonatitic) rocks from the Asuncion-Sapucai graben (Paraguay),
that highlight the intriguing Pb-isotope relationships involving the Urubicı´-Khumib tholeiites. The essential role of the Tristan plume is
difficult to determine. The spatial distribution of such uncommon high-TiO2 tholeiites reveals that similar lithospheric components may
exist in different cratonic blocks and associated mobile belts.

The eastern border of the Sa˜o Francisco craton is characterized by widespread Mesoproterozoic (1.0 Ga) tholeiitic dykes and minor
analogues of Early Cretaceous age (130 Ma). The Mesoproterozoic dykes (Salvador, Olivenc¸a, Espinhac¸o, Diamantina) show large
elemental and Sr–Nd isotopic variations that suggest different parental melts related to a small-scale heterogeneous mantle of depleted
residua and enriched components (Statistical Upper Mantle Assemblage, SUMA), responsible for plume- and crust-type signatures. The
Mesoproterozoic intrusions, compatible with early stages of Rodinia breakup, may represent the initial breakup of the Sa˜o Francisco–
Congo junction. Early Cretaceous dykes (Espinhac¸o) reveal normal and reversed polarities, indicating two distinct intrusive periods.
These intrusions have elemental and Sr–Nd isotopic compositions similar to those of the coeval (132 Ma) high-TiO2 tholeiites from
southern Parana´ Basin (Urubicı´-type, Brazil) and northern Etendeka (Khumib-type, Namibia). The genesis of these tholeiites requires
lithospheric mantle components, as represented by K-alkaline (and carbonatitic) rocks from the Asuncion-Sapucai graben (Paraguay),
that highlight the intriguing Pb-isotope relationships involving the Urubicı´-Khumib tholeiites. The essential role of the Tristan plume is
difficult to determine. The spatial distribution of such uncommon high-TiO2 tholeiites reveals that similar lithospheric components may
exist in different cratonic blocks and associated mobile belts.